Device for honing interior surfaces



Dec. 20, 1955 R. W. FISHER DEVICE FOR HONING INTERIOR SURFACES 2 Sheets-Sheet 1 Filed June 1, 1954 FIG.4.

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DEVICE FOR HONING INTERIOR SURFACES Filed June 1, 1954 2 Sheets-Sheet 2 FIG.6.

INVENTOR RAYMOND W. FISHER ATTORNEYS United States Patent 6 This invention has to do generally with apparatus used for grinding or honing an interior cylindrical surface of an object such, for example, as the interior of the bell end portion of a concrete pipe.

In the making of concrete pipe of the type having a bell end, particularly pipe cast by the centrifugal process, difficulty is encountered in producing a smooth interior surface in the bell end of the pipe. Thus, where conditions require a smooth surface in this region, as where pipe sections are sealed at the joint by means of a resilient seal ring or gasket, it is necessary to grind or hone the interior of the hell.

it is an object of this invention to provide novel and improved apparatus -or honing or grinding the interior cylindrical surface of a bell end portion of a concrete pipe or other object.

Another object of the invention is to provide apparatus in the nature or" a honing or grinding head of simple construction which is adapted to be fixedly mounted on a motor-driven shaft for rotation within the object to be honed.

Another object is to provide a device of the type indicated in which the honing elements, such as stones, are resil ntly supported radially with respect to the axis of rotation of the apparatus as a whole and in which means are provided for effecting radial adjustment of the honing elements.

These and other objects will be apparent from the drawings and the following description.

to the drawings:

Fig. l diagrammatically illustrates a device embodying the invention shown conjunction with a bell end pipe, the inner surface of the bell of which is to be ground;

Fig. 2 is a face View of the front of the device of Fig. l, as indicated by line 22 of Fig. l, but on a larger scale;

3 is a side elevational view of the device of Fig. 2; 4 is a fragn entary sectional View on line 4-4 of o iS a face View of the rear side of the device of 6, 7, 8 and 9 are sectional views on the lines 66, 7- S-$S, and 99, respectively, of Fig. 2.

More particularly describing the invention, in Fig. 1, i show a concrete pipe 11 resting horizontally on supports 12 and having a bell end 13 with an inner cylindrical surface 14 which is to be ground smooth. To accomplish this, I provide a honing device, generally indicated by which is shown mounted on the shaft 15 of a motor 17. The motor is supported upon a stand 18 and it can be assumed that the stand incorporates suitable means for adjustably positioning the motor 17 to align it axially with pipe 1 Also, means would be provided for advano ing the motor to insert device 15 in the pipe to hone surface 14.

Referring now to the remainder of the figures of the drawing, the invention resides in the apparatus which has been generally indicated by numeral 15. This -includes a plate-like body or-head plate 20 which is pref-- erably circular. Extending rearwardly fromthe bodyu-is a hub 21 which may have a 'keyway 22 so that the body can be keyed to the shaft 16 of the motor 17.

Mounted on the front side of the body 20 are a-plu-- rality of stone-supporting assemblies 24, each of which;

carries a grinding stone 25 having an outer surface 26- which is curved to the approximate radius of the surface; to be ground. As will later appear the stones 25 areresiliently mounted such a manner that they can be adjustably positioned radially of the turning axis of the body. Any number of the stone-supporting assemblies mayibeprovided, since this is a matter of convenience and de pends to a large extent on the diameter of the surface to be ground. In the form of the invention shown, four such assemblies are provided. Each of the assemblies includes a stone mounting receptacle or box 28. Each of these has an inner side plate 29, an outer side plate 30, and

a seat plate 31 against which the stone is positioned, the" seat plate extending between the side plates as best shown in Fig. The box also has a pair of end guide plates-33- which have tongues 34 slidable in grooves 35in guide 1 blocks 36. The latter are secured to the body in any.

suitable manner, as by welding, for example. The stone I 25 is secured in the pocket 38 by means ofone or more set screws 39 in the side plate 39.

The stone boxes are resiliently mounted upon radially adjustable carrier plates 41 having a main portion 42 and an end wall The stone box is secured to the end wall by means of bolts 44, which are secured by nuts 45, and by compression springs 46 extending between the stone seat plate and the end wall of the carrier plate.

The carrier plates have wing portions 59 slidably received in guides 52 (Figs. 2 and 7) secured to the body.

For the purpose of adjustably positioning the carrier plates and hence the stones, 1 provide a rearwardly project ng pin 54 on each carrier plate which extends through a slot 55 in the body and has its inner end received within an angularly disposed arcuate slot 56 in a cam plate 58. The latter is of annular shape and is mounted in an annular recess 59 on the rear side of the body 20, being retained by a locking ring 68 held by screws 61.

The major portion of the periphery of the cam plate is provided with gear teeth 62 which are adapted to mesh with the teeth of a pinion 64 which is rotatably mounted on the body 24). The pinion is provided with a tool-receiving hub 65 for the purpose of turning it, the hub being shown as hexagonal by way of example. With this arrangement, it will be apparent that by rotation of pinion $4 the cam plate is turned to simultaneously adjustably position the carrier plates and hence the stones toward or away from the periphery of the body 2%) in a direction radially of the turning axis of the device as a whole. A portion of the periphery of the cam plate is formed to provide ratchet teeth 66 which are engaged by a pawl 67 mounted on a pin 63 and urged into engagement with the teeth by conventional-type torsion springs 69. The pawl prevents rotation of the cam plate in a direction which would permit inward movement of the stone-mounting assemblies.

I also provide a gauge 71 on the device which is shown as a finger 72 pivotally mounted at 73 upon bracket 74 on body Zll. A tension spring 75 connects one end of the finger with the body to hold it in retracted position. The finger projects through a slot 76 in the body. The finger and slot are so proportioned that when the finger is fully pivoted to the broken-line position shown in Fig. 9, the outer end 78 of the finger will indicate the radius desired of the surface being honed. Thus, by test from time to time it can be determined if the surface has been honed to the desired amount, since it will be impossible to fully pivot the finger until the surface has been sulficiently ground away.

In operation, the device is mounted upon a motor-driven shaft as shown in Fig. 1 and inserted within the member to be honed, being adjusted to be concentric therein. The cam plate is then adjusted to bring the stones into engagement with the surface 14 to be ground. The motor is started to rotate the device at high speed, causing a grind ing of surface 14. Depending upon the width of the surface the device may be fed into the pipe after a portion of the surface 14 has been ground. As conditions may require, subsequent adjustments of the stones may be made by stopping the motor and subsequently turning the pinion 64.

While I have shown and described a preferred form of my invention, I contemplate that various changes and modifications may be made therein without departing from the invention, the scope of which is indicated by the claims.

I claim:

1. In a device of the type described, a circular head plate having a central hub for receiving a motor-driven shaft, means on said hub for fixedly securing said head plate to the shaft, a plurality of receptacles mounted on said plate at circumferentially spaced regions for movement toward and away from the periphery of said plate, a stone mounted in each of said receptacles for projection beyond the periphery of said plate, a carrier plate mounted on said head plate inwardly of each said receptacle for movement in the same direction as the receptacle, a resilient connection between each carrier plate and its adjacent receptacle, and means carried by said head plate for simultaneously adjustably positioning said carrier plates.

2;,In a device of the type described, a circular head plate having a central hub for receiving a motor-driven shaft, means on said head for fixedly securing said head plate to the shaft, a carrier plate mounted on one side of said head plate for movement toward and away from the periphery of said head plate, said carrier plate having a transverse end wall at its outer end, a receptacle mounted radially outward of said carrier plate for movement in alignment with said carrier plate, a grinding stone in said receptacle, compression spring means interposed between the end wall of said carrier plate and said receptacle, means connecting said receptacle and said carrier plate adjustable to limit the maximum spacing of said receptacle from said carrier plate whereby to place said compression spring means under adjusted compression, and means carried by said head plate for adjustably positioning said carrier plate.

References Cited in the file of this patent UNITED STATES PATENTS 656,664 Roth Aug. 28, 1900 1,511,165 Jaeger Oct. 7, 1924 1,601,813 Emerson Oct. 5, 1926 2,138,257 Sievers Nov. 29, 1938 FOREIGN PATENTS 869,911 Germany Mar. 9, 1953 

